Original post by lala5646
express 3x^2-18x+16 in the form a(x-b)^2+c
no idea!
no idea!
Completed square form - are you studying GCSE?
If you haven't learned this then expand out the brackets and compare coefficients - post your working
Original post by Muttley79
Completed square form - are you studying GCSE?
If you haven't learned this then expand out the brackets and compare coefficients - post your working
If you haven't learned this then expand out the brackets and compare coefficients - post your working
so would it be 3(x^2-18x)+16
Original post by lala5646
so would it be 3(x^2-18x)+16
No - that's not the same -- if you are going to do it like this you need to take out a factor of 3 from 18 too
a(x-b)^2+c = what when expanded?
Original post by Muttley79
No - that's not the same -- if you are going to do it like this you need to take out a factor of 3 from 18 too
a(x-b)^2+c = what when expanded?
a(x-b)^2+c = what when expanded?
ah so would it be 3x(x - 6)+16
Start by just taking out the 3 from x^2-18x
So it is 3(x^2-6x)+16
Then complete the square
So it is 3(x^2-6x)+16
Then complete the square
(edited 2 years ago)
Original post by lala5646
ah so would it be 3x(x - 6)+16
Just take out the factor of 3 - you need the other terms
This should explain the method
Original post by lala5646
so would it be 3(x^2 - 2x) + 9
Not quite,
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